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Description
Steroids directly influence androgen receptors, while many peptides studied for muscle growth affect growth hormone or recovery pathways

Accelerated Storage for Shelf-Life Prediction of Lyophiles: Temperature Dependence of Degradation of Amorphous Small Molecular Weight Drugs and Proteins

Concentrations usually range from 0.1-1% in most leave-on products
References Neelakantan H, Vance V, Wetzel MD, et al